(function (doc, win) {
			        var docEl = doc.documentElement,
			          resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
			          recalc = function () {
			            var clientWidth = docEl.clientWidth;
			            if (!clientWidth) return;
			            docEl.style.fontSize = 100 * (clientWidth / 375) + 'px';
			          };
			        if (!doc.addEventListener) return;
			        win.addEventListener(resizeEvt, recalc, false);
			        doc.addEventListener('DOMContentLoaded', recalc, false);
			  })(document, window);

